Thevakumar, J., Owen, J. orcid.org/0000-0003-0778-0858, Purnell, K. et al. (2 more authors) (2025) Assessment of carbon steel and corrosion resistant alloy corrosion in geothermal environments containing sulphuric acid. Corrosion Science, 257. 113319. ISSN: 0010-938X
Abstract
This work focusses on understanding corrosion severity and pipeline material performance within model geothermal sulphuric acid (H2SO4)-containing environments. A tantalum-lined high pressure/high temperature autoclave is used to assess the corrosion behaviour of N80 carbon steel compared to 13 Cr and 22 Cr duplex stainless steel when exposed to H2SO4 solutions between a pH of 2–4, and at a temperature of 150 °C. Significant increases in solution pH were observed during 20-hour exposure experiments, resulting from acid consumption due to ongoing corrosion reactions. The resulting pH shift led to a notable reduction in corrosion rates over time, creating uncertainty when assessing long-term material degradation under variable environmental conditions. To address this uncertainty, corrosion rates were analysed in the early stages of exposures, enabling a reliable correlation between temperature, pH and metal composition. Linear polarisation resistance (LPR) measurements revealed that corrosion of carbon steel was primarily influenced by solution acidity, with temperature playing a secondary role. A comparative analysis of corrosion performance revealed that uniform and pitting corrosion rates decreased in the following order: carbon steel > 13 Cr stainless steel > 22 Cr duplex stainless steel. These results offer valuable insights into material selection and corrosion mechanisms relevant to geothermal energy applications.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2025 The Authors. This is an open access article under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited. |
Keywords: | Electrochemistry, Carbon steel, Stainless steel, Duplex steel, Geothermal, Sulphuric acid |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Mechanical Engineering (Leeds) |
Date Deposited: | 01 Oct 2025 13:20 |
Last Modified: | 01 Oct 2025 13:20 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.corsci.2025.113319 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:232390 |